VENOUS RETURN IN THE ABSENCE OF CARDIAC DRIVE

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Abstract
Blood was drained from the azygos vein of dogs in a modified type of Riml expt. The amts. of blood recovered were compared in groups of animals subjected to the following procedures: 1, pulmonary artery and aorta clamped under light anesthesia, 40 ml./kg.; 2, \ arteries clamped under deep anesthesia, 32 ml./kg.; 3, arteries clamped in curarized animals, 27 ml./kg.; 4, arteries and spleen pedicle clamped, under deep anesthesia, 30 ml./kg.; 5, arteries and spleen pedicle clamped under light anesthesia, 39 ml./kg.; 6, dead animals, arteries clamped 23 mins. after exptlly., induced ventricular fibrillation, 23 ml./kg. A control group was bled without any arterial clamping and yielded 46 ml./kg. Splenic contraction contributes very little, if any, blood to the total yield, but skeletal muscle activity accounts, apparently, for about half the total yield. Elastic forces persistent in tissues even after death, may account for the remainder of the blood yield.

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